The 1955 Open Championship was the 84th Open Championship, played 6–8 July at the Old Course at St Andrews in St Andrews, Scotland. Peter Thomson won the second of three consecutive Open titles, two strokes ahead of runner-up John Fallon. Thomson won a total of five Claret Jugs, the last in 1965.
The prize for the winner was increased from £750 to £1,000, the other prizes remaining unchanged. The total prize money was therefore increased from £3,500 to £3,750.
Qualifying took place on 4–5 July. Entries played 18 holes on the Old Course and 18 holes on the New Course. The number of qualifiers was limited to a maximum of 100. Ties for 100th place would not qualify. The qualifying score was 148 and 94 players qualified. On the first day Frank Jowle scored 63 on the New Course and after a 72 on the Old Course he led the qualifiers on 135, a shot ahead of Laurie Ayton. The maximum number of players making the cut after 36 holes was set at 50. Ties for 50th place did not make the cut.
Five Americans were in the field of 94, three professionals and two amateurs. All five made the cut and the top U.S. finisher was Ed Furgol in a tie for 19th place. Byron Nelson, whose only previous appearance at The Open was a fifth-place finish in 1937, tied for 32nd. The two amateurs finished in the top thirty.
Previously the 17th hole (the "Road Hole") was a par 5; for this Open it became a par 4, which reduced the course par from 73 to 72.
Wednesday, 6 July 1955
Thursday, 7 July 1955
Amateurs: Bucher (+2), Conrad (+4), McHale (+4), Lawrie (+5), Carr (+9), Murray (+11), Orr (+13), Robertson (+15).
Friday, 8 July 1955 - (morning)
Friday, 8 July 1955 - (afternoon)
Amateurs: Conrad (+5), McHale (+7), Bucher (+23).